(1/x²-1/x)*(x三次方+x²)过程要详细
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(1/x²-1/x)*(x三次方+x²)过程要详细
(1/x²-1/x)*(x三次方+x²)
过程要详细
(1/x²-1/x)*(x三次方+x²)过程要详细
(1/x²-1/x)(x³+x²)
=(1/x²-1/x)(x+1)x²【将x²乘到第一个括号里】
=(1-x)(1+x)【平方差公式】
=1²-x²
=1-x²